Terahertz scanner could see skin cancer

A new way to generate terahertz signals on a low-cost silicon chip could be used to identify skin cancers too small to see with the naked eye, detect explosives, and make a sort of super-Bluetooth that could transfer an entire HD movie in a matter of seconds.

“I can envision a tiny thing you could put in a cell phone,” says Cornell University engineer Ehsan Afshari.